YOU HAVEE TO PICK TWOOO ANSWERS.

What were two environmental effects of the damming of the Colorado River?

The river’s delta lost all its vegetation and became desert like.

Water stopped nourishing the ecosystem of the river’s delta.

Native species inhabiting the river’s delta lost their habitats.

Dust Bowls became common occurrences in the river’s delta.

Farmers started using the river’s delta for cultivation purposes.

Answer: the correct answers are water stopped nourishing the ecosystem of the river's delta and native species inhabiting the river’s delta lost their habitats.

Explanation: the cost and consequences of damming a river are:

- 40-80 million people displaced by dam projects in past 50 years

- Sediment settles behind dams, filling reservoir and not nourishing downstream floodplains

- Small risk of catastrophic failure

- Habitat alteration (upstream and downstream)

- Lost recreational opportunities on river

- Fisheries declines from thermal pollution and blockage of migration

- Disruption of flooding that builds topsoil